[SI-LIST] Re: Crystal osciiator not oscillating
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 23 May 2007 15:06:11 -0400
> 2) By keeping the load capacitance value same as 15pF, a 100K
> externalresistor between the XTAL &EXTAL pin of the microcontroller,
> population starts oscillations.
I don't know much about xtal oscillators, but I'm wondering if there might
be a DC bias problem with the circuit. With the circuit not oscillating, is
the input (one of the pins) biased so that the inverters are in their linear
(amplifying) region? Perhaps the 100K resistor is needed to help make that
happen.
Andy
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